Threat Levels

The threat level to the UK from international terrorism is currently SEVERE: an attack is highly likely.

The threat level was previously increased from SEVERE to CRITICAL on September 15, 2017. The threat level returned to SEVERE on Sunday September 17.

We continue to encourage the public to remain vigilant and report any suspicious behaviour which may be terrorist-related. Members of the public who have any information about unusual activity or behaviour should contact the confidential Anti-Terrorist Hotline on 0800 789 321. In the event of an immediate threat, always dial 999.

If you see or hear something that could be terrorist related, act on your instincts and call the police, in confidence, on 0800 789 321, or visit www.gov.uk/ACT

You can also report online content that concerns you or which you think could be illegal by visiting www.gov.uk/ACT

The threat level for Northern Ireland-related terrorism in Great Britain is SUBSTANTIAL, meaning an attack is possible but not likely. This was last reviewed in May 2016.

Assessments of the level and nature of the threat from international terrorism are made by the Joint Terrorism Analysis Centre (JTAC); the Security Service (MI5) is responsible for setting the threat levels from Irish and other domestic terrorism